💬 Power Meter Pulse Sensor

[flopp]

@moumout31
Watt calculation is using time between two interrupts.
How often do you send watt?
Did you measure watt with a measurement tool How did you get 500 watts from power meter?
When you send watt you need to measure exact same second otherwise it will not be correct.

[moumout31]

@flopp Watt is sent every 20 seconds (as done in the original sketch).
500 watts is the power indicated on the screen of the power meter.

[NiklasO]

Just changed from 1-wire counter to MySensors for logging my power consumption. Using the same LED detector as I did when using 1-wire. Also changed watt limit to 20 000 (my heat pump likes to use 9-10kW sometimes). The wires from the old 1-wire net now provide power for the new MySensors-sensor. I have 10 000 led blinks per kWh. Had som crazy counter values with 1-wire that totally messed up the graphs and haven't seen anything like that with this sketch. Let's hope it stays that way. ;) Dumping data to Domoticz. This sensor gives me higher resolution as a bonus. The 1-wire counter was read every minute, this every 20-sec. ;-)

My old 1-wire counter with one crazy value messing upp all the graphs:

I know that you can hold shift and click the value that is crazy to make the graphs show up good but you loose the data for the full day. That's not good. ;-)

[Samuel235]

I seem to be getting a connection to my gateway, while monitoring the two topics for the gateway i only seem to see any activity regarding this sensor on the gateway-out topic, and it keeps sending out a type 2 message (req). The serial monitor of the sensors is showing:

104198 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
114199 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
124200 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
134201 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
144202 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
154203 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
164204 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
174205 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
184206 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
194207 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:

So it seems to be sending a request package, but i don't see it on the gateway-in topic and i see other sensors sending data to the gateway-in topic so i'm not subscribed to the wrong one. Is this a structural request message or is this the feature that requests the last known message from the gateway? Either way, there doesn't seem to be any sensor data being sent from the node to the gateway.

[sundberg84]

@Samuel235 said in 💬 Power Meter Pulse Sensor:

164204 TSF:MSG:SEND,16-16-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:

I dont know if I dont understand you, but it seems like your node is requesting the last pulse counter. I have mentioned this in several threads I have a problem with this (both this thread and rain sensor thread). Im using an ethernet gw and the request reaches the gw but there my error led blinks and it fails to send it back (or recieve it on the node) so it re-request it.

I have never been able to pinpoint it due to repeaters in between.
https://forum.mysensors.org/topic/2116/hard-to-grab-time-and-value-sent-from-controller/ (old).

[Samuel235]

@sundberg84 - You do understand me correctly :). I made a thread on the troubleshooting section of the forum for this simply because i suspected it was normal behaviour, however. It seems that the node isn't sending any other data to the gateway at all and it can not get the previous value as there isn't one. So, my post here and on the troubleshooting section was me aiming to get to this point and then troubleshoot the actual node to see what can be done to get it to send data.

[Samuel235]

Has anyone came across their pulse meter not sending the message for WATT, the other two messages are being sent perfectly fine. My WATT message has been working all day and suddenly stopped.

[NiklasO]

Make sure that you don't reach your wattage limit in the sketch.

[Samuel235]

@NiklasO - Where is this value stored? I've cleared the EEPROM and the MQTT topic too, but it still refuses to send the watt value.

[NiklasO]

@Samuel235
In the sketch, change this
#define MAX_WATT 10000 // Max watt value to report. This filetrs outliers.
I have it set to 20000, using 15 000 easily when it's cold outside. ;-) Just make sure that you use the right divider for your pulse/kWh count.

[Samuel235]

Ahh i see what it is it; its set to not send if it hasn't changed.... how much of a silly error that was from me. The wattage is way below 1000 but because i'm using a normal LED on another arduino flashing at a constant rate to set my node up, its not changing the watt value.

Back to solving my initial issue now >.<

Thank you.

[NiklasO]

Ah, I see. Well, I would like the sensor to send data even if it hasn't changed. What did you change?

[gohan]

Watt usage is normally changing all the time, so you should have data reported quite often

[NiklasO]

@gohan But Samuel235 had that problem? ;-) Edit: well, ok, he had a different setup. I need to read better. ;)

[Samuel235]

To be honest, i had it running for a while before it stopped sending the WATTS. But i'm guessing this is the issue as if i vary the blinks it sends it. I'de like to see if anyone has this working recently on OpenHAB through means of not touching the node sketch like people have posted before. I have an idea to send the data of the pulse count message onto the request message topic on MQTT and so then when it requests previous count it would have it.

[Samuel235]

This post is deleted!

[mickecarlsson]

EDIT:
This was not the case, I am still debugging the issue, in the mean time I have deleted the code.

After some debugging it seems that Domoticz messes with the V_WATT and V_KWH, and the solution is to have two sensors, one for kWh and one for W.
After I changed it, I have consistent W and kWh.
See also this issue for Home Assistant

[mickecarlsson]

OK, I think I have nailed it. I am now running a beta code pulling S0 from my energy meter and I am getting consistent results.
Before when I checked the domoticz.db I got this for Energy:

sqlite> select Name, sValue from DeviceStatus;
Storage kWh|0.000;4773.700

Now I get this:

sqlite> select Name, sValue from DeviceStatus;
Storage kWh|118.000;11678062.000

Notice that the first field is now with value, previously it was 0.000 (and I have updated the meter count to the actual value)
And in table Meter I now get consistent results:

sqlite> SELECT Value, Usage, Date FROM Meter WHERE DeviceRowID=43;
11678003|1170|2017-07-22 09:25:00
11678012|1170|2017-07-22 09:30:00
11678021|1180|2017-07-22 09:35:00
11678031|1180|2017-07-22 09:40:00
11678043|1170|2017-07-22 09:45:00
11678053|1180|2017-07-22 09:50:00
11678062|1180|2017-07-22 09:55:00
11678072|1180|2017-07-22 10:00:00

The field Usage is now populated as it should.
I will let the code run for a couple of days, then I will post the updated code here.

[mickecarlsson]

Here is a code example that works for me. I have an energy meter with S0 output and I use Domoticz as the controller.

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik EKblad
 * Version 1.1 - Mikael Carlsson
 *
 * DESCRIPTION
 * This sketch provides an example how to implement a sensor reading from an energy meter
 * Use this sensor to measure KWH and Watt of your house meeter
 * You need to set the correct pulsefactor of your meeter (blinks per KWH).
 * The sensor starts by fetching current KWH value from gateway.
 * Reports both KWH and Watt back to gateway.
 *
 * Unfortunately millis() won't increment when the Arduino is in
 * sleepmode. So we cannot make this sensor sleep if we also want
 * to calculate/report watt-number.
 * http://www.mysensors.org/build/pulse_power
 */

// Enable debug prints
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

#include <MySensors.h>

#define DIGITAL_INPUT_SENSOR 3  // The digital input you attached your light sensor.  (Only 2 and 3 generates interrupt!)
#define PULSE_FACTOR 1000       // Nummber of blinks per KWH of your meter
#define SLEEP_MODE false        // Watt-value can only be reported when sleep mode is false.
#define MAX_WATT 10000          // Max watt value to report. This filters bad data.
#define CHILD_ID 1              // Id of the sensor child

unsigned long SEND_FREQUENCY =
    20000; // Minimum time between send (in milliseconds). We don't want to spam the gateway.
double ppwh = ((double)PULSE_FACTOR)/1000; // Pulses per watt hour
bool pcReceived = false;
volatile unsigned long pulseCount = 0;
volatile unsigned long lastBlink = 0;
volatile unsigned long watt = 0;
unsigned long oldPulseCount = 0;
unsigned long oldWatt = 0;
double oldKwh;
unsigned long lastSend;
MyMessage wattMsg(CHILD_ID,V_WATT);
MyMessage kwhMsg(CHILD_ID,V_KWH);
MyMessage pcMsg(CHILD_ID,V_VAR1);


void setup()
{
    // Fetch last known pulse count value from gw
    request(CHILD_ID, V_VAR1);

    // Use the internal pullup to be able to hook up this sketch directly to an energy meter with S0 output
    // If no pullup is used, the reported usage will be too high because of the floating pin
    pinMode(DIGITAL_INPUT_SENSOR,INPUT_PULLUP);

    attachInterrupt(digitalPinToInterrupt(DIGITAL_INPUT_SENSOR), onPulse, RISING);
    lastSend=millis();
}

void presentation()
{
    // Send the sketch version information to the gateway and Controller
    sendSketchInfo("Energy Meter", "1.0");

    // Register this device as power sensor
    present(CHILD_ID, S_POWER);
}

void loop()
{
    unsigned long now = millis();
    // Only send values at a maximum frequency or woken up from sleep
    bool sendTime = now - lastSend > SEND_FREQUENCY;
    if (pcReceived && (SLEEP_MODE || sendTime)) {
        // New watt value has been calculated
        if (!SLEEP_MODE && watt != oldWatt) {
            // Check that we dont get unresonable large watt value.
            // could happen when long wraps or false interrupt triggered
            // We need to send in all values at one time to get consistent data
            if (watt<((unsigned long)MAX_WATT)) {
                send(wattMsg.set(watt));  // Send watt value to gw
                Serial.print("Watt: ");
                Serial.println(watt);
                oldWatt = watt;
                send(pcMsg.set(pulseCount));  // Send pulse count value to gw
                Serial.print("pulseCount: ");
                Serial.println(watt);
                double kwh = ((double)pulseCount/((double)PULSE_FACTOR));
                oldPulseCount = pulseCount;
                send(kwhMsg.set(kwh, 4));  // Send kwh value to gw
                Serial.print("kWh: ");
                Serial.println(kwh);
                oldKwh = kwh;
            }
        }
        lastSend = now;
    } else if (sendTime && !pcReceived) {
        // No count received. Try requesting it again
        request(CHILD_ID, V_VAR1);
        lastSend=now;
    }

    if (SLEEP_MODE) {
        sleep(SEND_FREQUENCY);
    }
}

void receive(const MyMessage &message)
{
    if (message.type==V_VAR1) {
        pulseCount = oldPulseCount = message.getLong();
        Serial.print("Received last pulse count from gw:");
        Serial.println(pulseCount);
        pcReceived = true;
    }
}

void onPulse()
{
    if (!SLEEP_MODE) {
        unsigned long newBlink = micros();
        unsigned long interval = newBlink-lastBlink;
        if (interval<10000L) { // Sometimes we get interrupt on RISING
            return;
        }
        watt = (3600000000.0 /interval) / ppwh;
        lastBlink = newBlink;
    }
    pulseCount++;
}```

[dakipro]

One (probably stupid) question about the batter powered option: Since sensor cannot keep track of real time power usage as it sleeps most of the time, would it be possible to do the math on the controller side and get "5min delay real time power usage"?
By dividing number of pulses since last transmission, is that basically what this sensor is doing when not being powered by batteries?

I could experiment with 2min delay f.eks, and see how batteries hold. If dht22 temp sensors works over a year with 5min transmission time, i hope 2min delay in pulse meter can hold 6mnt or something?
Another thing is that the electrical box is all metal, and there is a lot of electricity around the sensor so radio could struggle (I guess a repeater would definitively help)